<template>
  <div style="background: #4CAF50">
    <div class="login-box">
      <h2>食疗养生系统</h2>
      <form>
        <div class="user-box">
        </div>
        <a @click="jump">
          <span></span>
          <span></span>
          <span></span>
          <span></span>
          开始使用
        </a>
      </form>
    </div>
  </div>
</template>

<script>
export default {
  name: "HelloWorld",
  data() {
    return {
      username: '',
      password: '',
      msg: ''
    }
  },
  methods: {
    jump() {
      this.$router.push("/mainpage")
    }
  },
}
;
</script>

<style>
/*body {*/
/*  background-image: url(../assets/sousuobackground.jpg);*/
/*  background-repeat: no-repeat;*/
/*  background-size: 100%;*/
/*}*/
/*#building {*/
/*  background: url(../assets/sousuobackground.jpg);*/
/*  background-size: 100% 100%;*/

/*}*/

.login-box {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 300px;
  padding: 40px;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, .5);
  box-sizing: border-box;
  box-shadow: 0 15px 25px rgba(0, 0, 0, .6);
  border-radius: 10px;
}

.login-box h2 {
  margin: 0 0 30px;
  padding: 0;
  color: #fff;
  text-align: center;
}

.login-box .user-box {
  position: relative;
}



.login-box .user-box input:focus ~ label,
.login-box .user-box input:valid ~ label {
  top: -20px;
  left: 0;
  color: #03e9f4;
  font-size: 12px;
}

.login-box form a {
  position: relative;
  display: inline-block;
  padding: 10px 20px;
  color: #03e9f4;
  font-size: 20px;
  text-decoration: none;
  text-transform: uppercase;
  overflow: hidden;
  transition: .5s;
  margin-top: 40px;
  margin-left: 192px;
  letter-spacing: 4px
}

.login-box a:hover {
  background: #03e9f4;
  color: #fff;
  border-radius: 5px;
  box-shadow: 0 0 5px #03e9f4,
  0 0 25px #03e9f4,
  0 0 50px #03e9f4,
  0 0 100px #03e9f4;
}

.login-box a span {
  position: absolute;
  display: block;
}

.login-box a span:nth-child(1) {
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, #03e9f4);
  animation: btn-anim1 1s linear infinite;
}

@keyframes btn-anim1 {
  0% {
    left: -100%;
  }
  50%, 100% {
    left: 100%;
  }
}

.login-box a span:nth-child(2) {
  top: -100%;
  right: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, transparent, #03e9f4);
  animation: btn-anim2 1s linear infinite;
  animation-delay: .25s
}

@keyframes btn-anim2 {
  0% {
    top: -100%;
  }
  50%, 100% {
    top: 100%;
  }
}


@keyframes btn-anim3 {
  0% {
    right: -100%;
  }
  50%, 100% {
    right: 100%;
  }
}

.login-box a span:nth-child(4) {
  bottom: -100%;
  left: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(360deg, transparent, #03e9f4);
  animation: btn-anim4 1s linear infinite;
  animation-delay: .75s
}

@keyframes btn-anim4 {
  0% {
    bottom: -100%;
  }
  50%, 100% {
    bottom: 100%;
  }
}
</style>
